Common Core Standards and Curriculum mapping

I am a first grade teacher and a graduate student working on a paper for a globalization class.  With the addition of the Common Core standards, most states will be working toward students obtaining the same set of skills.  As a teacher I find when a student moves into the classroom from a different district, because our curriculum maps do not match, I may have already covered a topic he/she has not yet been taught or vise-versa.  I'm wondering your thoughts on having a standard curriculum map to accompany the Common Core standards so that students moving from state to state and school to school would have an easier transition.